Manual Transmission - Good T-56 Upgrade company?

A friend of mine is looking to upgrade his tranny. he previsouly had a tremec t56 rated at 750hp. he was making 650hp and 620ft/lb at the wheels and broke it on street tires. He wants to upgrade it and checked into the TRANZILLA and it's $6,000! to upgrade his current one. He checked into six speeds inc but it seems they have went out of business? If anyone knows of someone that would be a cheaper alternative please let me know, thanks.

what did he break in the trans?

he dumped it in 3rd and he thinks the input shaft exploded....

I would figure out what is broken before jumping the gun .

Check us out - http://www.TICKshift.com

Yeah check out www.tickshift.com, Jonathan build's some awesome 6-speeds.